Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa73adff2eac5fc…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 02:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25262e52337beb08e281ae8333a87a51 SHA-1: 85dd379032a13bdd43db4de3e000dc182777cf51 SHA-256: bfa73adff2eac5fc74185c4e3b04a72e3a53560421baeeef0cfbb41de98b33ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, forming a link farm. This suggests the primary purpose is to redirect users to malicious or phishing websites, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=editor+de+pdf+adobe+reader PDF link annotation
    • https://durimawar.com/contents/files/jolufotebifunigasepukug.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a7b23ab458acf9a0b3d284401c1fd228/peseduwezaniruko.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/58419067765.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5e4d0178f12807f1fb6587c17cd327ab/tapubozol.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/kelotijewisagerenow.pdfIn PDF document text
    • https://12waktu.com/contents//files/pevigigotuwusaleziz.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/32678600292.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/57896977736.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/zasodelotifotujevozipo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c690290b3ee---445762100.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/webukori.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/vovipe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076702642fcd---lepixonipak.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vtfha0p92u55vkg6207gc1m0kp/bifokugunaborerixesumagid.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/80149379469.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/41557973526.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7c9406c6---74480721453.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87dea6c1c---79819606069.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7782edb69f91ea55104a2679c10537f7/70269789810.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/h5gt3upskh26ngrc7ds3ka3otu/50297565699.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5ja0udued9vjqen662qd2f4utc/vamujomevizaninaxo.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/69140754812.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/akcnm12uf4t35aifdkrvq0rcg0/vamalolafava.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83E 10296 bytes
SHA-256: 717f3940b7db480bc3ebe52c591920d1a928614ab3aa48d8a48c991af4276f56
font_01_sfnt_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 18308 bytes
SHA-256: 5ed19fcf174c91b1405d375d6ef5a7001896b86b756364935b66de715dd0d109
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068

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